aqsl: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On CentOS possible default full paths are:

/usr/bin/aqsl - from package: aqsis-core

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/aqsl - from package: aqsis

You may install the required package with command apt-get install {package}

Error in other languages:
aqsl: bevel nie gevind nie
aqsl: comandă negăsită
aqsl: comando não encontrado
aqsl: commande introuvable
aqsl: command not found
aqsl: käsku ei ole
aqsl: không tìm thấy lệnh
aqsl: komanda nerasta
aqsl: Kommando nicht gefunden.
aqsl: kommandot finns inte
aqsl: komut yok
aqsl: nie znaleziono polecenia
aqsl: níor aimsíodh an t-ordú
aqsl: no se encontró la orden
aqsl: no s'ha trobat l'ordre
aqsl: opdracht niet gevonden
aqsl: parancs nem található
aqsl: perintah tidak ditemukan
aqsl: príkaz nenájdený
aqsl: příkaz nenalezen
aqsl: команда не найдена
aqsl: командата не е открита
aqsl: 命令找不到
aqsl: コマンドが見つかりません